Padlock



J. H. SHAW PADLock oct. 2s, 1930.

Filed Nov. 8, 1928 gru/ventola Patented Oct. 28, 1930 UNITED, STATES JOHN H. SHAW, F NEW HAVEN, CONNECTICUT, AssIGNon'zro sAEGEN'r a COMPANY,

-. v E NEW HAVEN, CONNECTICUT 1 lin euJ'LocE v i Application filed November `8, v1928. Serial 110,313,025.YAY

This invention relates to padlocks, and more especially to a padlock so constructed thatv that part of the locking mechanism which comprises the key barrel and tumblersv may be removed from the case ofthe lock, as

a unit, and a new unit inserted therefor, so as such a case, it has often been necessary to completely discard the original lock and buy`r anew one. This is, ofcourse, a relatively expensive matter and in the presentconstruction I have Aprovided a padlock inV which a key change may be eected in a much more economical manner. w

.In order to edect thisend, I have provided a padlock, from vthe case of which the key receiving member and thetumblers maybe readily removed from the case Vwhen the shackle is in unlocked position, but fits removal is rendered* impossible when the shackle is in operative lock position.

One object of my invention is to provide a padlock wherein the locking mechanism may be placed in and removed from kthe case unit. f y. I A vfurther objectV of my invention is to provide a detachable unit for padlocks, which* unit'is designed to'compriseA the key-barrel, ami tumblers, andmeans for detachably se-V curing said unit within the case of the pad, lock,A which means will be inaccessible to permit removal of the lock when the shackle isl in f locked position. v p

yAnother object of my invention isthe provision of a padlock lof the Character described,

which may be economically manufactured' without sacrificing any of thel advantages of convenience and security whichl such a lock should possess."

To these and'other ends, the invention consists inthe novel features and combinations of parts to be hereinafter described and claimed. In the accompanying drawings:

Fig. 1 isa top plan view of the lock, embodyingmyinvention, Y y

Fig. 2 is abottom plan view of the lock; Fig. 3 isa side'el'evational View;

f Fig. 4 is a sectional view online 4 4 of Fig. 1, the lockshackle, however, being shown inl elevation; l

`Fig. 5 is a` sectional view on line 5-5 of v Fig. 6 is an elevational view of the key barrel vand tumbler unit, which' is removable from the case of the padlock, and j 1 Fig.,y 7 is a sectional view online 7.# 7 ofl Fig.4. n y -f Y The preferred embodimentv of my invention which I-have selected to illustrate and describe, comprises a lockv case 10, which in this instance,consists merely of a hollow shell having an opening of oblong shape extending completely therethrough, although4 it will be understood that such a through opening is not necessarily essential in all aspects of the invention. 'In the upper part of this opening there is inserted within Vthe shell, a housing 11. This housing is formed inv cross section to accurately -t theopening through the casing, and comprises a topplate 12, which is solid except for the openings 13' and 14, designedto receive the legs ofthe shackle 15. This housing is also provided'with a lower plate` 16, andbetween theupper and lower plates 'is provided with a pocket or cavity within which lockingbolts 17 and 18 are' `scribed hereinafter.' The body-'porti'ons of these bolts slide :uponrpins'21 and 22, so that they maybe held in proper position against the upper plate 12. In orderthat they may be normally urged to locked position, springs 23 and 24 are arranged to act against the rear ends ofthe' bolts'and force themv outwardly.

Ineach case, the spring which acts upon the rear end of one bolt, reacts upon thehead of the other bolt, so thatla compact and simple ico Y slightly reduced extension 36,' which iitsYK arrangement is provided, which tends at all times to keep the bolts in protracted positions, or in positions where the heads 19 enn gage within the recesses 25V and 26 in the legs of the shackle. Y

The longer legA of the shackle is provided with a lshoulder 27 which willfbev engaged, by the bolt head 19, to prevent the complete removal of the shackle from the lock.

InMFig. 6 is shown 'the unit" 28, containing the locking mechanism which may be remov able and insertable bodily into the padlocky case. This is, of course, inserted from the' lower end and is provided with. a lower plate or base 29 which iits snugly'into theopening through the caseandg againsta narrow shoulder 30 so that the platev 29 is substantially' iiushwith thelower edge ofthe casinglO. This unit comprisesa cylindrical casing 31, containing' the key plug or barrel 32,7andfhaving a pinl tumbler extension 33,which contains pin tumblers of the usual type in; the present embodiment. Upon the upper.Y end of the key barrel are provided pins 34 and35,

designed to engage withy the lugs 20 tojretract the bolts 17. and 18 whenithe key barrel is turned.

f lThe cylindrical; case 317. isprovided-jwith a snuglyx into an opening 36?-in; thelower plate 16 of the housing 11, so. as tol definitely locate and, position the-,unit 28 inthelock case with respect to theflockingfbolts 17 and 18.

Inthe upperz end of thepi-n tumbler eXtension` ismounted a threaded. screw 37;, providedwith acam-shaped or mutilated' head' 38, shownfmore especially in FigJ, whichl head isdesigned, whenturned in one position,

to enter a'slot 39 in-the side ofthe lock case immediately below the shorter legof the; shackle. It willbe apparent froml an inspection of Fig.` 5 thatwhen this screw is rotated so that thestfraight or cut away edge is tof ward the adjacent side of the lock case,the screw head'will not be engaged in the slot 39, and the l unit containing the locking mechanism may then be removed from the case.

rIhe longer shackle upwardly until itsshorter legis disengaged from theopening 14.

The operation of my improved structure lis as follows. It will, of coursebe obvious that when-the parts are inV therposition showninA Fig. 4,'and the-propergkey isi'nsertedyinthe key barrel32,-thisbarrel-may be rotated and during such rotation the pins 34-and;35-wil1 I contact with the lugs v2O upon the lock bolts* 17 and 18, and withdraw' these bolts from the recesses 25 and 26 in the shackle. The shackle will then be forced upwardly by the spring 40 Y until the shorter end clears the upper plate 12 of the housing 11, and the shackle may then be rotated in the usualiway.l so that the lock may be disengaged from a hasp or the like with which it may be used. In this open Vthe latter.

"' :When the parts are in this position a screw drvenmay be insertedhthrough the shackle 0penin'g14'and the screw 37 turned until its head isfdisengagedfrom the s101139.: The

unit 28may then bev freely withdrawn from the` lock, as'it is held in place solely by this screw. It is, of course,lbcated in the lock by@y meansof the snugfit of the extension 36in the opening of thelowerplatel ofthe housv ingl 11but the extension-is freely withdrawable from this opening when permitted. as straight downward movement, as shown in Fig. 4, as isthe case when the screw headis disengaged from the recess/39. The engagement oftheextension 36-ingthe opening of the plate 16, serves,however,tofpreventany tiltingJ-offthe unit. 28, which might allow this unit to;be removed whetherror vnot the screw headis disengaged from' the slot.

When, the w.screw has been. turned to the proper *position andf-the'junit 28 removedI from the lock, a similar unit requiring a diHerent key-may then be placedinthe -lock case and the screw upon it' turned to engage the slot. It will; be-seen,.therefore, that the removalof thetumbler unit andthe replacing of' an othenlsimilar'lunit, is donein ani extremely simple,`A and expeditious manner;

It will .also be obvious v.that the screw head 39 is inaccessible when the shackle is in locked position,y sovthat when the lockis in-use itI will be impossible for the tumbler-unit to'be removed and the lock forced in this manner.y Itis apparent, however, that with the shackle infunlocked position thetumbler unit may beremoved by the'extremelyr, simple opera- Y tionofrturning the screw'SS apartial turn with the screw-driver, which completely releases this unit. y e l v While IV haveshown .andfdescribed ay preferr'ed embodiment of 'my invention, it 'will' be understood that it is not to be limited to all l the details shown, but is capable of modificar tion and variation, within the spirit ofthe inventionV and: within'the scope ofthe appended claims. f v i What I claim is':` Y

1. A padlock comprising a casing anda. shackle, a tumbler vmechanism insertable into and removable as a unit fromV said.l casing, meansftov secure said ruiiit.V within :the casing, said means being inaccessible whenthe shackle is in lockedposition, landwmeans independent of saidv unit for securing the shackle to the casing when the former is in` open position. a

2. A padlock having a casing, vand a shackle received in openings in the casing, locking mechanism removably mounted in the casing, means for securing said mecha-l nism in place, sai-d means being accessible for release of the locking mechanism through one of the shackle openings, and means vindependent of said removable locking mechanism for securing the shackle to the casing securing said' unit in place within the casing, said means being releasable through one of the shackle receiving openings, and means independent Vof said insertable mechanism for securinor the shackle to the casing when the former is in open position,

5. In a padlock, a casing, a shackle received in openings in the casing, bolt mechanism to secure said shackle in place, bolt operating means comprising a key barrel, and controlling tumblers therefor insertable as a unit within the casing, and means disposed below one end of the shackle for releasably holding said bolt operating means in place, sai-d bolt mechanism engaging the shackle when the latter is unlocked to secure it to the casing. a

6.' A padlock comprising a casing and a shackle received in openings therein, a imivKU:

tary locking mechanism insertable into and removable from said casing, co-engaging means on the wall of the casing and on the l locking mechanism to hold the latter in place,

said means comprising a recess in the wall of' the casing, and a member mounted on the locking mechanism and movable into said recess, a plate in the casing, and inter-engaging means provided on said plate and locking mechanism to position the latter in the casing.

7. A padlock comprising a vcasing and a shackle received in openings therein, ka unitary locking mechanism insertable into and removable from said casing,'co-engaging means on the wall of the casing and on the locking mechanism to hold the latter in place,

said means comprising a recess in thewall of the casing and a member rotatably mounted on the locking mechanism and having a camshaped portion to-enter said recess, a'plate in the casing, and inter-engaging means on said locking mechanism and plate to cooperate with said co-engaging means. 8. A padlock comprising a casing and a shackle received in openings therein, a unitary locking mechanism insertable into and removable from said casing, co-engaging means on the wall of the casing and on the locking mechanismto hold the latter in place, l said means comprising a recess in the wall of the casing and a member rotatably mounted von the locking mecha-nism and having a camshaped portion to enter said recess,` said member being accessible ythrough, one. of the shackle openings', and means in the casing to engage said locking mechanism .and prevent disengagement of said rotatably mounted member from said recess. Y Y f 9. -A padlock, comprisinga casing having `an opening therethrough, a bolt mechanism positionedin one end oit said opening, a lock mechanism 'insertable through the-other end of'said opeing, a shackle, said bolt mechanism comprising a bolt adapted to engage the shackle, vmeans to secure said locking mechanism in place, said means-being positioned below one end of the shackle and said bolt mechanism, andjsaid'lock mechanism having inter-engaging parts whereby the former is operated by the latter.

10. A padlock, comprising a casinghaving'y an opening therethrough, a bolt mechanism positioned in one end of said opening, a locky niechanisniinsertable through the other end of said opening, a shackle, said' bolt mechanism comprising a bolt adapted to ,engage the shackle, means to secure said locking mechanism in place, saidY means being positionedy below one end of the shackle and said bolt mechanism, and said lock mechanism having inter-engaging parts whereby the former is operated bythe latter, said bolt mechanism being provided with an opening, and said lock mechanism being provided with a part iitting in said opening to position one mechanism with respect to the other. a v

l1. A padlock, comprisinga casing having an opening therethrough, a bolt mechanism Y,

insertable into one end of said opening, said mechanism comprising a housing, and a bolt movably mounted therein, said housing having shackle receiving openings in its outer face, and locking mechanism. insertable into vthe other end of the casing, andineans'tosecure said lock mechanism in place ycomprising inter-engaging parts on saidy casing and said lock mechanism7 and other inter-engaging parts on said housing and said'lock mechanism In witness whereof, I have hereunto set my hand this 30th day of October, 1928. 'c

JOHN H. sriiiwT .y 

